The eagerly anticipated CyanogenMod 12S update for the OnePlus One smartphone is expected in a few days.

After failing to meet the 30 March time frame for releasing CyanogenMod 12S featuring Android 5.0.2, the company said: "Unfortunately, CM12 won't be OTAing today due to certification issues as well. All parties are working together to resolve the problems as soon as possible. I understand the frustration and we will definitely be more careful with our ETAs in the future."

OnePlus co-founder Carl Pei has now confirmed that the update has already received certification and it will be rolled out within a few days.

Meanwhile, Steve Kondik, chief technical officer at Cyanogen, in response to the CM12S delay for OnePlus One said through a Google+ post: "Seriously though, a new test suite came out because of MR1 literally the same day as we submitted, and so we had to redo the whole process with the new one."

He further confirmed the OTA will be out as soon as possible. "It's just as frustrating for us because we are in scramble mode and really want to ship our hard work. Hopefully we'll get the signoff in the next day or two. We'll immediately send the OTA as soon as we get that email."

"We usually send the OTA in batches and watch our systems for any weird logs at first. Since a lot of users make changes that we can't always predict, we have to make sure things aren't breaking. For example, we just learned that the recovery they (Oxygen) are installing (some TWRP version) often fails to flash all of the baseband images, bricking tons of devices to EDL mode when they try and return to CM. We have a setup that I'm comfortable with my Mom using, but there's no real way to accommodate for arbitrary mods of the stock ROM," explained Steve in reply to a query with regards to the availability of a download link for the update.

Last week, OnePlus released its native operating system OxygenOS which is light and carries subtle and useful features including Gestures, Customization and Quick Settings. The OS is bloatware- free and designed to deliver streamlined performance.